تعیین رابطه هدایت هیدرولیکی اشباع و تخلخل مؤثرتحت شرایط مدیریت سطح ایستابی شورکم‌عمق

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار دانشگاه شهید چمران اهواز

2 استاد دانشگاه شهید چمران اهواز

3 دانش آموخته کارشناسی ارشد

چکیده

یکی از راه‌های مقابله با بحران آبی،استفاده از آب‌های نامتعارف (مانند آب‌های شور زیرزمینی) با مدیریت زراعی مناسب برای جلوگیری از اثرات منفی است.استفاده از این آب‌ها، ممکن است بر هدایت هیدرولیکی اشباع تأثیر بگذارد. اما اندازه‌گیری مستقیم هدایت هیدرولیکی اشباع مستلزم صرف هزینه و وقت زیادی است. لذابه‌منظور بررسی اثر شوری و عمق سطح ایستابی با مدیریت خاکپوش بر هدایت هیدرولیکی اشباع و تخلخل مؤثر و نیز یافتن رابطه‌ای بین آن‌ها برای این شرایط، آزمایشی لایسیمتری در قالب کرت‌های دو بار خردشده بر پایه بلوک‌های کامل تصادفی با سه سطح شوری آب زیرزمینی (4S1=<، 8S2= و 12S3=دسی‌زیمنس‌برمتر)، دو سطح عمق سطح ایستابی (90 D2=‌ و 60 D1= سانتی-متر) و دو سطح پوشش خاک (M1= بدون مالچ و M2= برگ خرد شده خرما) در سهتکرار انجام شد.قبل از شروع آزمایش و15 ماه بعد از اعمال تیمارها، هدایت هیدرولیکی اشباع و تخلخل مؤثر اندازه‌گیری شد. اثر تیمارهای مورد اشاره دربالا بر ایندو پارامتر در سطح پنج درصد معنی‌دار نبود. البته تیمار دارای مالچ باعث کاهش غلظت املاح در عمق ریشه، رشد بیشتر نهال و ریشه و به‌تبع‌آن افزایش هدایت هیدرولیکی اشباع نسبت به تیمارهای بدون مالچ شد. برای برآورد غیر مستقیم هدایت هیدرولیکی اشباع، بین این پارامتر و تخلخل مؤثر روابط مختلفی برازش شد که بهترین رابطه بین Ln(KS) و تخلخل مؤثر یک معادله سیگموییدی با ضریب تبیین 73/0 به‌دست آمد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Determine the relation of saturated hydraulic conductivity and effective porosity under shallow saline water table management

نویسندگان [English]

  • Parvaneh TishehZan 1
  • AbdAli Naseri 2
  • Zahra Izadpanah 1
  • Hosein Aziznasab 3
1
2
3
چکیده [English]

One of the ways to deal with water crisis is the use of unconventional, such as subsurface brackish water mixed with a proper crop management. The use of such water may affect the saturated hydraulic conductivity. A direct measurement of saturated hydraulic conductivity requires the expenditure of a lot of time and money. A lysimeter experiment was conducted to investigate the effect of water table salinity and depth management on saturated hydraulic conductivity and effective porosity and as well, to determine the relationship among them. The statistical design was a split-split plot arrangement of a randomized complete block design of three replicates for each treatment. Treatments included 3 levels of groundwater salinity (main plot; S1=<4, S2=8 and S3=12 dS/m) and 2 levels of water table depths (sub plot; D1=60 and D2=90 cm) and 2 levels of soil surface cover as sub plots (M1= no mulch and M2= date palm leaves mulch). Prior to the start of the experiments and as well 15 months past of the treatments, saturated hydraulic conductivity as well as effective porosity were recorded. The treatments indicated no effect on these parameters at 5% level. But mulch treated samples led to a decrease of soil salinity increasing seedling growth as well as root volume. As a result, these treatments showed to increase the saturated hydraulic conductivity. The relationship between saturated hydraulic conductivity and effective porosity was investigated using regression analysis. The best fit between Ln (KS) and values was concluded by a sigmoidal function (R2=0.73).

کلیدواژه‌ها [English]

  • Soil characteristics
  • Date palm
  • Water table
  • crop management

مراجع

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تحقیقات آب و خاک ایران
دوره 47، شماره 1
اردیبهشت 1395
صفحه 99-108

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